RE: [Histonet] formalin precipitate/Iron artifact
|From:||"Marshall Terry Dr, Consultant Histopathologist" |
Am I in a parallel universe?
Iron from a few seconds in a stainless steel needle?
Is this some soluble iron salt? If so how does it survive watery fixation and processing?
Is it insoluble iron? If so what is it doing on the surface of stainless steel?
Saundra Johnson did not describe it as particulate. Why is everyone assuming it is so?
Surely what is being described is simply an edge artefact which is seen *very* commonly on the edges of liver biopsies stained with Perl's. It is a faint blush - no more, and the clue to its being an artefact is that it is non-particulate and at the edge. PAS sometimes shows a similar phenomenon.
Beam me up Scottie.
Dr Terry L Marshall, B.A.(Law), M.B.,Ch.B.,F.R.C.Path
Rotherham General Hospital
From: Gayle Callis [mailto:email@example.com]
Sent: 18 November 2005 16:49
To: Rogerson Kemlo (ELHT) Pathology; Histonet@lists.utsouthwestern.edu
Subject: RE: [Histonet] formalin precipitate/Iron artifact
You are not talking rubbish. We occasionally "pin" tissues to cork for
fixation but use (aluminum?) hypodermic,disposable needles - they don't
rust. However, you bring up an excellent point as some pins, particularly
those we thought useful and purchased from a sewing store did rust - tossed
A possible source of iron contamination is the specimen container with the
lid as the culprit. Years ago, before the advent of good specimen
containers, people recycled baby food jars whose lids rusted excessively
and exfoliated rust/iron contamination onto the samples during
fixation. If one has metal lids on containers, check them for rust and
don't use them.
Or possibly, are they returning any reagent in some type of metal can? We
had metal cans whose liners failed, and rusted. We used these for
refilling/bulk alcohol storage and rusty gunk poured out! Check the
storage containers also.
At 05:56 AM 11/18/2005, you wrote:
>Could it be from the needle? Are needles made of iron? Am I talking
Research Histopathology Supervisor
Veterinary Molecular Biology
Montana State University - Bozeman
PO Box 173610
Bozeman MT 59717-3610
406 994-4303 (FAX)
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